Woodruff School of Mechanical Engineering
Simple Fabrication of Carbon Nanotubes and Related Materials for Energy Storage and Electronic Applications
Prof. Suguru Noda
Waseda University, Tokyo, Applied Chemistry
Wednesday, May 25, 2016 at 11:00:00 AM
MRDC Building, Room 4211
Seung Woo Lee
Extensive research has been made for carbon nanotubes (CNTs), and many attractive prototype devices have been demonstrated. To realize such applications, however, production processes still needs be improved and established. We have established millimeter-scale growth of CNTs on substrates  and customized the growth process for different application targets. For display applications, several μm-tall CNT emitter arrays were grown in a few seconds on patterned electrodes by simply heating the electrodes resistively without breaking the glass substrates . For LSI applications, 1 g/cm3-dense CNT arrays were grown on conductive TiN layer at temperature as low as 400 C . For thermal interface materials, 50 μm-tall, 0.3 g/cm3-dense CNT arrays were grown on both faces of Cu foils, which realized small thermal resistance comparable to indium foils . Besides such applications to electronic devices, large-scale production of high-quality CNTs is highly demanded. We have realized semi-continuous production of sub-millimeter-long, highly-pure (>99 wt%) few-wall CNTs (FWCNTs) by fluidized bed [5,6], and applied such CNTs to battery/capacitor electrodes. Self-supporting hybrid electrodes of activated carbon (90 wt%) and CNTs (10 wt%) prepared by co-dispersion and filtration realized three times larger capacitance than the pure single-wall CNTs (SWCNTs) [7,8]. Such enhanced performance using inexpensive materials is encouraging for practical applications. Si-CNT anodes and S-CNT cathodes for lithium ion batteries will also be presented. We are also working on rapid vapor deposition of Si and metals targeting at electric energy storage devices. Several μm-thick, porous Si and Si-Cu anodes were directly deposited on Cu current collectors quickly in ~1 min, which show fairly high gravimetric and areal capacitances [9,10]. Such quick fabrication of various functional materials is now possible using simple methods.
Suguru Noda is a professor at Department of Applied Chemistry, Waseda University, Tokyo, Japan. He received his PhD in 1999 from The University of Tokyo, Japan, became an assistant professor and associate professor there, and then joined Waseda University in 2012 as a full professor. He has conducted research in the field of materials processing, especially thin film processes by chemical and physical vapor deposition methods. He is recently focusing on practical production of carbon and silicon nanomaterials for energy and electronic applications such as rechargeable batteries and flexible electronics.